Doing Something when number points are increased.

Hello guys.
First thing i want to ask you is how can i check is my number of points is growing or it is stuck at some number.


I just want to activate particle system when the points are growing up and deactivate it when points are not growing.

Secoud thing is ive made this.


Its just checking my foliage is that type if it is removing instanced static mesh and replacing it with Actor BP but i want to replace it with another diffrent instanced static mesh how can i make this?

so no one help ?